Which architectural approaches are preferable for developing scalable and flexible systems: monolithic or microservices solutions?

For developing scalable and flexible systems, it is preferable to use a microservices architecture. It allows breaking down the application into independent services that can be deployed, scaled, and updated separately. This increases flexibility, simplifies maintenance, and accelerates development.

Monolithic solutions are simpler in initial development and deployment, but as the application grows, they become less manageable and harder to scale.

Therefore, if scalability and flexibility are important, microservices are the best choice, especially for large and rapidly growing systems.